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CHM 109 Fall, 2020 General Chemistry Laboratory I Pre-Lab Assignment 11: (10 points) Name: Please answer the following questions clearly and concisely using English sentences, math, equations, pictures, or diagrams as necessary. The objective is to convey your thoughts as clearly, yet briefly as possible. You may either print this out and complete it on this sheet of paper, or complete the assignment on a separate sheet of paper. 1. (3 points) If a solution of hydrogen peroxide (H2O2) is 2.8% (m/m) that means that for every 100 g of solution there are 2.8 g of H2O2. What is the molarity of the solution? (Assume the solution has the same density as pure water.) 2. (3 points) If 2.5 mL of the 2.8% H2O2 solution from Question 1 fully decomposes according to the following chemical reaction, how many moles of O2 gas should form? 2H2O2 ? 2H2O + O2 3. (3 points) If enough H2O2 decomposes to produce 0.412 moles of O2, and it is 21.0 °C in the lab with an atmospheric pressure of 0.985 atm, what volume will the O2 gas occupy in L? 4. (1 point) Would you like a free point? Please answer "yes" or "no".

          CHM 109 Fall, 2020
General Chemistry Laboratory I
Pre-Lab Assignment 11: (10 points) Name:
Please answer the following questions clearly and concisely using English sentences, math, equations, pictures, or diagrams as necessary. The objective is to convey your thoughts as clearly, yet briefly as possible. You may either print this out and complete it on this sheet of paper, or complete the assignment on a separate sheet of paper.
1. (3 points) If a solution of hydrogen peroxide (H2O2) is 2.8% (m/m) that means that for every 100 g of solution there are 2.8 g of H2O2. What is the molarity of the solution? (Assume the solution has the same density as pure water.)
2. (3 points) If 2.5 mL of the 2.8% H2O2 solution from Question 1 fully decomposes according to the following chemical reaction, how many moles of O2 gas should form?
2H2O2 ? 2H2O + O2
3. (3 points) If enough H2O2 decomposes to produce 0.412 moles of O2, and it is 21.0 °C in the lab with an atmospheric pressure of 0.985 atm, what volume will the O2 gas occupy in L?
4. (1 point) Would you like a free point? Please answer "yes" or "no".

CHM 109 Fall, 2020
General Chemistry Laboratory I
Pre-Lab Assignment 11: (10 points) Name:
Please answer the following questions clearly and concisely using English sentences, math, equations, pictures, or diagrams as necessary. The objective is to convey your thoughts as clearly, yet briefly as possible. You may either print this out and complete it on this sheet of paper, or complete the assignment on a separate sheet of paper.
1. (3 points) If a solution of hydrogen peroxide (H2O2) is 2.8% (m/m) that means that for every 100 g of solution there are 2.8 g of H2O2. What is the molarity of the solution? (Assume the solution has the same density as pure water.)
2. (3 points) If 2.5 mL of the 2.8% H2O2 solution from Question 1 fully decomposes according to the following chemical reaction, how many moles of O2 gas should form?
2H2O2 ? 2H2O + O2
3. (3 points) If enough H2O2 decomposes to produce 0.412 moles of O2, and it is 21.0 °C in the lab with an atmospheric pressure of 0.985 atm, what volume will the O2 gas occupy in L?
4. (1 point) Would you like a free point? Please answer "yes" or "no".

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